It depend where vibration are. Often (if you have a good mount for the telescope) all the structure vibrate and there are some good anti-vibration feet that can be useful. If the tripod isn't the problem and the vibration are only near the telescope, probably the problem is the mount that is under-sized for you telescope. In this case the only good way is change the mount with a sturdier one.
Depending on the root cause, vibration damping pads may or may not help.
Some telescope vendors sell sets of three for $50 or so;
an Internet search also yields a few do-it-yourself recipes using silicone caulk, sorbothane insoles, etc.
Other home remedies are possible,
such as adding weight or shims to the mount, or hanging a chain from the optical tube assembly.